She hasn't been caught in a lie, has answered every question truthfully, and has given the same answer when asked the same question over again. She has displayed she really wanted no parts of this case so she isn't in it for star power, and her recollection of the phone call does not help Zimmerman in anyway.
So how exactly is she messing up the case? Her attidude? Her looks? None of that matters in this court of law. Only you "be on your best behavior for whitey" ass nikkas are bothered by this.
Its obvious she isn't the smartest of people but she hasn't done anything to help the defense here, and the longer they drag this out with getting nothing to help them out the worse it looks for them.